ActionListener和组合框问题

Question

我目前遇到的问题是我要创建一个简单的网络浏览器，并希望编写每个访问过的网页的网址。无论如何，当历史记录组合框被URL填充时，.addItem函数正在触发我的动作监听器。有没有办法解决这个问题？

   Action Listener: 
   historyList.addActionListener(
            new ActionListener(){
                public void actionPerformed(ActionEvent event){
                    final String url= historyList.getSelectedItem().toString();
                    addressbar.setText(url); //set the address bar to the url 
                    historyArray[historynum] = url; //add the url to the array which contains the history
                    historynum = historynum + 1;    //move one up the history array
                    Display(url);           //display the url
                    backplace = 1;          //reset the amount of backs a user can take 
                    forwardBtn = false;     //not allow the user to go forward again
                }
            }
            );
   }

将配置文件中的URL添加到组合：

    for (String linehistory : Files.readAllLines(Paths.get("config.history"),Charset.defaultCharset())) {
        if (!(linehistory ==null)){
            for (String partHistory : linehistory.split("\\s+")) {
                String historylines = partHistory;
                if( i >6){
                    if (!(partHistory ==null)){
                        historyList.addItem(partHistory);
                    }
                }
                i = i +1;
            }
        }

我注意到了这一点，我认为可能是由于组合框的状态发生了变化，有没有办法将其更改为onClick？ http://imgur.com/aTg9n2E